Rangefinder binoculars

Abstract

The range binoculars include first and second observing optical systems, a laser beam-emitter for emitting a laser beam, a measuring optical system for collimating the laser beam and sending the collimated laser beam to a target. A laser beam-receiving device receives the laser beam reflected by the target, while a distance-determining device determines the distance between the observation place and the target from the flight time of the laser beam taken from the laser beam-emitter to the laser beam-receiver. A measurement-displaying device displays the measurements obtained by the distance-determining device.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to range binoculars, more particularly, the invention relates to a pair of binoculars having an optical system that measures distance and an optical system for observation. [0003] 2. Background Art [0004] Typically, conventional range binoculars emit an infrared ray as a distance-measuring laser beam, collimate and aim the emitted infrared ray at a target, then receive a reflected ray from the target, measure the flight time taken from the ray-emitting point to the reflected ray-receiving point, and determine the distance from the observation place, i.e., the ray-emitting point to the target. [0005] Conventional range binoculars are provided with a beam splitter, which permits an infrared ray to be transmitted, but does not permit visible rays to be transmitted between the objective lens of the optical system for observation and the erecting prism. As such, the infrared ray beam goes to the be...

AI Technical Summary

Benefits of technology

[0011] An object of the invention is to overcome the above-described drawbacks of conventional range binoculars. It is also an object of the invention to provide a pair of range binoculars which can be produced at a lower cost, has a lower degree of image degradation, and uses CF Type focusing means.

Problems solved by technology

Conventional range binoculars are provided with a beam splitter, which permits an infrared ray to be transmitted, but does not permit visible rays to be transmitted between the objective lens of the optical system for observation and the erecting prism.

To produce such high performance beam splitters is technically difficult, thereby resulting in high production costs.

Consequently, conventional range binoculars using such beam splitters are rather expensive.

Furthermore, such high performance beam splitters are not able to transmit all of the visible rays reaching the beam splitters.

Thus, conventional range binoculars, due to the presence of the beam splitter, inevitably reduce the transmittance of the observed visible rays and the resolving power thereof.

As a result, images are degraded using conventional range binoculars.

However, it is very difficult and almost impossible to find a space to place an internal focusing lens in such conventional range binoculars, because the beam splitter is already fixed between the objective lens and the erecting prism.

Thus, conventional rangefinder binoculars can hardly use the CF Type focusing systems, which is disadvantageous.

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